Finding the Fourth Proportional to 42,889.86, 64,344.81 and 13,306.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,889.86 : 64,344.81 = 13,306.16 : x
2. Step 2: Convert to fraction form
   42,889.86/64,344.81 = 13,306.16/x
3. Step 3: Cross multiply
   42,889.86x = 64,344.81 × 13,306.16
4. Step 4: Simplify right side
   42,889.86x = 856,182,015.31
5. Step 5: Solve for x
   x = 856,182,015.31/42,889.86
6. Step 6: Final answer
   x = 19,962.34